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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecd3487c18ce4feb58ce736e455c90a481f121401021f4e2584ce2f586da2fa' 
  AND token = 'csCa89VirDdXlZPVcuMmCS0R5NDYONrKmiLdrnaRndk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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