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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28365437fa68ac39fb52b0eb91bee55b6039fab913dbf53c8898c41156f2e2de' 
  AND token = 'RLm51DHxNnovfur1yJNLbfy0BUvMLLob5ZMhFw5BTIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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