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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3169d92581cd9fbecef4648f522f97b8e247503f0f0e8fe36ae29a44830c7da0' 
  AND token = 'b4tjLBEBc7cAun1BcJCwcGKl9dLuo4eyr8G0I5UXyQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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