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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa90c9422c157d001ac56360e1b98cc7f557e7d4ece8a4d6dc0cb536d9cbb34' 
  AND token = 'LSS4vK4+6QUu596BoVu4bBWSH5HzYMwh6a9WoQmaUqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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