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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefecdd134e5fbb52d98cf35921744da5511970261eff3a61243713fb385a55d' 
  AND token = 'Tc/PecHAxfwzJgttoXpQOaNImKnTmGKYc6FJJQEWNNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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