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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47b827200f78b60c0d880a9d0ea872cc75cb73e49a769d280e51f9d7740959c' 
  AND token = 'LdaJQgEzZrczz50j6qpSWkg4SSBqKaHTvwpjJ6nz99I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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