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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f57fc3d4ff6145d21c5e872dbe75bf3231d42e3dd8355bd9701401b8f311b3' 
  AND token = '0tzbyGn54wW9rL+AfS3azFSRj7hWfBCvkQKHKrJc91w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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