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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8c7bf878889cf31bfc8b35a4aaf96b8b7fe1b7bbd572845d78b2b3e0c56ef0' 
  AND token = '0SmlJW4yafiO16R89tmp3LD0BUvJvvt4f1Wl6ci3Epk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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