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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34504fee9859e520c44cf3e84ddd4a0032ba930caa3ab26dc4d628f7d92b2032' 
  AND token = '3hvBr6x9o0f8iFW4M+0A9vCde6+NL7MFbER8T9je77g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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