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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e6593b1b12895092e5b7efe928c5b08a9bffc2036980d15f300f2953ca57fe' 
  AND token = 'HFAviU6Pq7F5xMgNaY39l/QsepOjAzEvCXY04bRKOPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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