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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9a41b61a1bfd1c2bd82efbfc14ed10f23f8f1a2cbc4ae35f1a6f7e45385ab2' 
  AND token = 'Ggf6UiIEUiAT7VfFtkXZSs1ss3IefN7AlYjCMl7SZKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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