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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8de2be531fe631be0d5e9814e13e4e74d1d8794d630903c6704406b06a31a1' 
  AND token = 'tuNl6e+nMbkz4JVObUIsFcQdszzLAxEXYVSa041ZZ4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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