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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7706278484ca925ffd2cfb33c28f8ecb8fa122e319fa3c6a7a3f044e8c30a7e6' 
  AND token = '8Hqkm7/oJRHStsGMGCa+KtvyPkPyEyGQxsPIdVgvtio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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