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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4df4e537d7dba885ee113b5c4775003a129c7c629fecd8ff312bbf144f37522' 
  AND token = 'xyXOkJBFA9cYbXaAZT5a/LePxKY9hpGJ+ii2mcffG6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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