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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39f11843c7d14ef69298dc1bb49ce71caac630f5299482f0c4a7d99fc28e894' 
  AND token = 'jkWdCMw0te94NLtID9f4Y34sHU9gxmbNzVt3bkOFVWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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