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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d9338ba919fb66fd5a0360eff16ce3c41c34e94f3b47aa268370410e7beb51' 
  AND token = 'N2gzq7oYMIOxr1kfKdlFBIjD5WvnDVlVRPpFq5aGWI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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