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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8f93daf602616302430401359d02097438d01ecc997589829e1e8ba088bb4a' 
  AND token = '0S+jlaMb0nC2J3jtMD4AIK8UQjve7MQYc8rboov970k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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