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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a4cf4a63158393a7c15e55ee31c334cc2387e26aa25ec87c9fa308bf4e82d9' 
  AND token = 'cUnS09zw9ChWgbyn70w5g+itAUiCrU6hMj1g0KOvBo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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