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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f933e3045df1ae4a820d27ef5f2f1e4f505135bc2d15cb13471e3fb613cdefa' 
  AND token = 'u+Gk68rR2m4U+czDCJ+IHMnBayZFrBStEUyKyiRoivA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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