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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c3eac89a7adf4ef8f845749af22382c70015a9bdfe9080058b1680db6769ce' 
  AND token = 'cp5i0BjL62mr8kFNH3ihJ9mlnxS2rntQMcM6V3TdEzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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