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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8054d379587c917f247c801ad4abf7a4906e831bdbe2bbc1249e5dc31a4a22' 
  AND token = 'k52cSg8bbS7zIBcdCvdeq4zG0jEiNj2e0eCRqi9piEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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