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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfc5c67d61e92fd2c1f9766d6665b28963c4307edba199cff87b7b19e5b6be8' 
  AND token = 'j3HgRS5F84QbTiFdx1qr7AS2a7y42W0giLuqvAFUkl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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