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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a403921ee34ccefe20f203d696e1cb5615c1987fe07fb74cf7764130d4a59c25' 
  AND token = 'IvPOrkmXq8A93BposfeRyJ47Zjv72XEbKgsIQhFdb6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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