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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534b45c1e71f446567453c9254a0b29872c5b72bca1a5f07f40ff8a8fdfc4ca7' 
  AND token = 'yR1G7Ji8hNssYTcExWWDvWNpoXT6InXJHBj4vzvPsnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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