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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55191de77c0b0a010fba4df18388776f02e19b8a1408ce1d1a12e57baef863db' 
  AND token = 'rZ1FRFYQTumzZcQOu8C+Np14DlqFIy7w2Vv8meUEDaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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