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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb840219400863ad0caa2e4fa99efac84bf26e34b93dd1e2c0184c741458da1' 
  AND token = 'dCNv8OjjDRPn5IfiCK4k/W/K/1sB/mzIvkGJFtxUF7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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