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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb9d5529046069f095eb3743735cfbfb92bb4097e2207d7557faa69b2da5e3a' 
  AND token = 'DQUGxih/P6N7UpsD2SiNBJuie94k1n3++i10yMnBhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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