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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad0c61a122cb2ddc1054d4b5eab1f7f593b5061672415053c4a1409b14f103a' 
  AND token = 'nzELMY2ZPiSBl4ciqxbgCpBEUH8AEuX/qiPAIs+qYtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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