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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9131bb6542e239d4318814178b3aa5b9c7693fd22d61001c0f1ac6508269b528' 
  AND token = '2kqToVObvsgmZM3QLGnkH50v8NeDsjwOrh0yvg1vGdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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