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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcab45c3b9abf2205bdf16e2df98104b2baf9545ff80521eac24f56ad5d0026f' 
  AND token = '8Cx9juC4MDb1S594Wm/Wbq8OAPElq8YaDfaLvIDf/pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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