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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f87a90bc55c4033756d29306faed8d097c0f8c62aae5ca2836e590eedaa1c6b' 
  AND token = 'NumGDnSBeI+lsU6/fFSxpi8lzPQ+ZqLynwVq7vLxSME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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