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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6b6e2a2a9708b8432b734e1cdc96b3eb2cefa323cdf23d5ad30c8dce3336aa' 
  AND token = '6/08wzsR2X8lIRYCg2nMU+WTTdUE0TpUDipWXanIoOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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