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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3870d4293e1acbd49ea9b41dac9d0ba0963054752410f50c300a9e2befe0b154' 
  AND token = '9uzBJN/x975Qx6xjU5nkUXFpHOpwv2t89kod3PVtNsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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