SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd48045c707876e4549393b1e4768b75e6a9394e7cd1f89a4a064fb36fd68e7' 
  AND token = 'tt3gsanwFBrDhYKHCYzUTq+iFUseEKwYe/Ci2dUV2O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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