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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1b93c3e433486130f5ca68c892b2acd6e0ec7c5aeef9ed171a5eb2446d28c5' 
  AND token = 'dHKDi7cgov6n7ypNNYwjIiV7K56QQsz9b2SrvP2r8aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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