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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b022ec9faae148f7dcc1668efe319e0fbe1c08bf04e2abe2b9ae42cf30eee7f' 
  AND token = '672vCq0aEMBI/gsRaowxCpXmeVUiQCCJid/+JvehuAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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