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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1d94fa08601090cb4cd8bdd5a1da60fc70395f489c4fa0ff88e57bd8c3d3f5' 
  AND token = 'GiTh7aHs7XcvD8f3L88Oya27lEmj7OyTmFGCd+iWpFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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