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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5887bb56e3834b7d466168428bd2ceebc96d6f589c7a6b733e52bae50cd2480' 
  AND token = 'xo2/obKYlvYkqeSE2jfD3QhSr5c0KHHB6GkUPTNnhFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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