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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8517f1ab860cc4480d4e357d950f86bbc13eac5298f7248da0bef040f4c77f' 
  AND token = 'Q10rgUgMW0kpMVZ97OHCCerqF3coD8OS75SHQqpaJZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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