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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5c52c0c8fd40b3cca1ad1142de56d7f3f3441752e7a4d33b77d6a5de1221ca' 
  AND token = 'p+MS9+kcTmCECNj1WsmynfzyQTsEseiEEx8glyXCLGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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