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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cfd10ee7977135e26456a93d1c24bce555745d84b481ae4d208aa6b0567223' 
  AND token = 'tHOwa/RUQgggz4Pz3evd1k3niUyUGeDSU5H2mc2bDEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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