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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2330c8e205194390b38ce9f0188f08fa8aa21bde602dd0401a7189906e4cf640' 
  AND token = 'HppNDLrWmgyK2zAq3NW2iSUHqBhcchUzDyeCQTjnxio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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