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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8851d3cd8db53856a0d63b94188c8cfdcb83e33cfb669d060d923d32b336e4' 
  AND token = '3q6fnXxW9E5KpDcdYtv3Yq+X5KJliRTrotZyTuTsHes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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