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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43be272166ff7c42882c7344206370a5fcf09864338ce9a2c30d80232be34094' 
  AND token = 'ZhfD8C/o9e3cUnC5A6w4z4NVplLXgVZ9kjiy4uQl93I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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