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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31a5e7f15337b95c80f8fadb22c707b7f2ea7b0c99ab3f459d8776bb14453ca' 
  AND token = 'DDAOJYaN/SH9Awn8XSPlHPM1R9XdwNC0qTwh4g95bvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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