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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f283c8645c1f20786f328862a8d37da41a6463d2091cfb36c51cafcfffcb5ab6' 
  AND token = 'C7oXp6P7RmRp1eW9eNP19K7wl+aaIrl/rbmq5hHY6Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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