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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5c96e43220f236e23efc2cf7583d0ee6cd1aba57bfac3cdb8f6cd54dd3d25d' 
  AND token = 'aakjT5mqbDUeXaNI85hvqmEcXSJrfCnuBVfZ7/njR4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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