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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db5aa85b9aa496ffb3d633607f0bbe0311a842ef3e63b73b23627248f5ff588' 
  AND token = 'tqwfonOQAnmiZNLicVZuY1gkusu7m50AC/T3jPoZTiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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