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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa84e0939342f92277669708482f715bc2634a08e6b9244c0ec02ed299579bad' 
  AND token = 'jCBSentvl4JLMQiiesvp4Sfe0KMZ1fPW7d4vQhR4Sg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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