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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2a72e54005fbe653f8a86c810445164bdf9a3a0fa0ead38bef383d6d87290e' 
  AND token = 'Vf8AGtsctvrw7TeK7p4XXAqc/PduXzAwHrnJlZqygNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}