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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fbfe7eecfcf2afbccd44da80494a3b5c490ed518c374e57f7cfffc6b72cd01' 
  AND token = '57TlLNqbADRo7KheSk0RtsUjfiHc8TBEXar1b2oVvfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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