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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb185daa8d75438f8006a5ed457cd3671eca749f8b5e2c308159be11eb8dc445' 
  AND token = 'tEbgo3fbtwB61vIRb72gxNX3k7nVp/PDpe/P9TD60AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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