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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8db8d9a36b9aed30689236e0acb6fab82708e4542cf75a437f5fbf4e75c7a6' 
  AND token = 'IQcjA5STYZG/WYICUctlIGJHX5Q8K760cTvw9a7Ueqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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