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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a656f724dfdc058c8f046985ef6c83bb0ac9d1a0a703866a6d662856a277c5b' 
  AND token = 'MDAvJ7vw4Pdf9NhUVuKwrTndPvHl5RxsleVMJAr3Q0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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